The rubber trim or molding around driver's side window moves when i move the window up and down.

Went to the dealer, the service advisor says its common then he pulled out the rubber and tucked it back snug into place and used dry silicon spray can by Scotch 3M company. Now the window moves up and down like new, previously the rubber was getting dry and the window dry so too much friction.
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2008 G35 journey5at ivory/stone+prem&sportpkg.

 

I've noticed that ALL of the rubber trim pieces, and not just on the windows, is loose and just waiting to fall out. This includes the pieces around the engine compartment as well.
You have to be real careful around the trim pieces.